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I can't say which is "best," but an old-fashioned oiled K&N drop-in works for me. I think I paid $80. Very nice aggressive noise on hard acceleration. I wash it every 20k miles, as I've done on other cars for years. Never had an oil-clogged MAF. I'm skeptical that a pricey carbon-fiber intake would squeeze out much more power than a K&N or basic dry filter. But bling is zero, if that's important to you.
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Analog 2011 e92 M3 | Jerez Black | Black Novillo | 6MT | CF roof | No iDrive, Nav, M button, ZCP, EDC, or center hump | ZHP shift knob | OMP 1010 pedals | K&N filter | Dinan engine tune | OEM exhaust mod (bypass) | EAS exhaust tips | shaved front bumper | 19" Apex EC-7 | 12 mm rear spacers
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